gmst1 | R Documentation |
Calculate Greenwich Mean Siderial Time at 0h, UT1 (GMST1) from UT1 year, month, and day.
gmst1(yr = 2012, mo = 1, dy = 1)
yr |
UT1 year (integer) |
mo |
UT1 month (integer) |
dy |
UT1 day (integer) |
Function calculates Greenwich Mean Siderial Time at 0h, UT1 (GMST1) given UT1 year, month, and day.
Returns fractional hours of GMST1 with class fracHrs. The
corresponding print method gives hh:mm:ss format rounded to n
decimal
places in seconds by setting options('digits.secs'=n)
.
Multiply UT1 fractional day by 1.002737909350795 to get fractional sidereal day.
Andrew Harris
Explanatory Supplement to the Astronomical Almanac Seidelmann (ed), c. 1992
ymd2jd
out <- gmst1(yr=2012, mo=7, dy=8) str(out) out
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